Combustion Technology for Low-Emissions Gas-Turbines:Selected Phenomena Beyond NOx

[+] Author and Article Information
S. M. Correa, A. J. Dean, I. Z. Hu

GE Research and Development Center, P.O. Box 8, K1-ES112, Schenectady, NY 12309

J. Energy Resour. Technol 118(3), 193-200 (Sep 01, 1996) (8 pages) doi:10.1115/1.2793862 History: Received March 08, 1996; Revised May 20, 1996; Online December 05, 2007


Since recent reviews cover the issues in NOx formation under gas-turbine canditions, and since regulations essentially dictate use of the premixed mode of combustion for minimum NOx , this review concentrates on phenomena that can arise in premixed combustion. Specifically, 1) the initial unmixedness in a fuel-air premixer has been shown to make overall lean mixtures autoignite sooner than might be expected based on the overall fuel-air ratio, because the richer portions of the mixture lead the process;2) combustion pressure oscillations caused by the interplay between acoustic waves and unsteady heat release in a one-dimensional system can be calculated in good accordance with measured data, and set the stage for multi-dimensional CFD;3) carbon deposition arising from the flow of liquid fuel over metal surfaces such as found in fuel injectors and swirl cups has been described as a function of temperature and of surface composition; and 4) quenching and subsequent emissions of carbon monoxide can be minimized by preservation of a boundary-layer rather than an impingement type of flow over combustor liners.

Copyright © 1996 by The American Society of Mechanical Engineers
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